Psu and cooling/fan help

[4ever1Love]

I'm building my first pc, mostly for gaming and I'm trying to figure out what kind of psu I need, a couple wattage calculators gave me vastly different suggested watts. Also wondering if I should get any extra cooling systems/fans. I care nothing for aesthetics, strictly performance.
Build so far
asus sabertooth 990 r.2
amd fx-8350 black edition 8 core 4.0GHz
G.skill rampage x series 8gb (2×4gb) ddr3 1866
Gigabyte radeon r9 280x
Samsung 850 Evo 120gb ssd

Thanks in advance for any help you can give!

 

[JackNaylorPE]

Your GPU determines your PSU

http://www.guru3d.com/articles_pages/asus_radeon_r9_280x_top_review,8.html

This is Guru3D's generic power supply recommendation for the R7 and R9 series:

AMD R9 280X - On your average system the card requires you to have a 550 Watt power supply unit.
AMD R9 280X Crossfire - On your average system the cards require you to have a 750 Watt power supply unit as minimum.

If you are going to overclock GPU or processor, then we do recommend you purchase something with some more stamina.

Given your Crossfire MoBo, selection, I'd get a 750 watter if using at stock, and 850 watter if overclocking

http://pcpartpicker.com/part/evga-power-supply-110b20750vr
http://pcpartpicker.com/part/evga-power-supply-110b20850v1

I think you will find that you cn get 2133 CAS 9 or 2400 CAS 10 for within $5 of those 1866
http://pcpartpicker.com/part/gskill-memory-f32133c9d8gxl
http://pcpartpicker.com/part/gskill-memory-f32400c10d8gtx

Add a SSHD to speed up game loading ... 2 TB model id $25 more
http://pcpartpicker.com/part/seagate-internal-hard-drive-st1000dx001

If you find your build cost breaking $850, I'd consider an Intel 4690k / Z97 based build

 

[Dark Lord of Tech]

PCPartPicker part list / Price breakdown by merchant

Power Supply: EVGA 750W 80+ Gold Certified Fully-Modular ATX Power Supply ($104.99 @ SuperBiiz)
Total: $104.99
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2015-02-22 21:44 EST-0500

 

[4ever1Love]

Fantastic thanks! Another question, can my mobo run a 2400 it shows its max as 1866? I'm still kinda figuring all this out, much appreciated.